Magnetic Effects Physics GCSE

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  • Created on: 06-04-13 07:54
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1/29/13 GCSE Science/Magnetic effects of a current - Wikibooks, open books for an open world
GCSE Science/Magnetic effects of a current
GCSE Science/electricity
When a current flows down a wire it creates a magnetic field. To see
this, place a small plotting compass near the wire and turn the current
on. The compass needle will deflect. The shape of the magnetic field
around a wire is circular. Look at the diagram on the right. The wire
is coming straight out of the screen so you only see it's cross section
(the red circle) The plotting compasses show how the field wraps
around the wire.
Creating an electromagnet
Solenoids are made by coiling
Stumble wire. The magnetic
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looks like the field of an ordinary bar magnet.
A solenoid makes a pretty weak bar magnet on its own, but if a piece of iron is put inside the solenoid, the
field becomes much much stronger.
Try the following experiment:
Wrap a piece of plastic coated wire around a pencil.Remove the pencil then connect to a power
supply set at 1V DC current. Sprinkle iron filings around the coil of wire. Put a plotting compass
near the wire. Try to pick up a paper clip.
Wrap a piece of plastic coated wire around a large nail. Repeat all of the above experiments
You will find that the solenoid with the iron core is much much stronger than the one with the air core.
Q1) Why is it important to use plastic-coated wire?
Making the field stronger
To make the field stronger we can:
Use a soft iron core 1/2

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GCSE Science/Magnetic effects of a current - Wikibooks, open books for an open world
Increase the amount of current flowing in the wire
Increase the number of turns on the solenoid.
Reversing the field
To make the north pole and south pole swap positions we can:
Reverse the direction of the current by swapping the positive and negative leads on the power pack.
Wind the wire the other way round. {So if you wound it clockwise, take it off and wind it
counterclockwise.…read more


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